Maeve O’Neil, a 19-year-old freshman at George Washington University, knew she was sick — but had no idea just how dire it had become. It was seeing a dramatic spike in her respiratory rate, resting heart rate and body temperature through her device that gave her the courage to get it checked out — before it was too late. “It started around 3 a.m., while I was staying with my mom in a hotel after having been incredibly sick for six days,” she recalled.  “I woke up and instantly knew something